The decrease of leukorrhea before menstruation is a normal physiological phenomenon, and there is no need to worry. Leukorrhea is a kind of secretion secreted by the female vagina, so it may change with the menstrual cycle, as long as the leukorrhea flows normally, and the color does not change to yellow, green, or odor and other symptoms occur, it is a normal phenomenon. The secretion of leukorrhea is also affected by estrogen in the patient’s body. Before menstruation, estrogen in the female body will fluctuate, and the secretion of leukorrhea will be affected to a certain extent, which will result in the reduction of leukorrhea. If the decrease in leukorrhea is accompanied by vaginal itching, vaginal odor, etc., it may be triggered by vaginitis, and the patient needs to go to the hospital for examination in a timely manner to prevent the condition from worsening.